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danny,
the 2675 kJ/kG is the number for 100% steam. the 417.5 kJ/kg number is for pure liquid. You could consider yourself to have two streams, the steam having the 2675 kJ/kg and the liquid having the 417 kJ/kg number independtly of one another, but to determine how much of the original amount is in each, you have to consider them together. Those H_liq and H_vap numbers basically tell you how much of the original energy is necessary to vaporize steam, at the exit conditions of your valve. Does that help?
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